Table 1 Characteristics at baseline and tomographic indices.

From: Increased choroidal thickness is not a disease progression marker in keratoconus

 

Mean/median (SD/IQR)

Range

Baseline characteristics

Women, n

18 (23.7%)

Right eye, n

50 (65.8%)

Age, years*

24.0 (6.75)

14 to 30

BCVA, decimal*

0.90 (0.28)

0.10 to 1.00

SphEq, D*

 − 1.25 (2.16)

 − 6.75 to 0.75

KC Classification*

2.50 (1.50)

0.5 to 3.5

Tomographic indices

Kmax, D

55.13 (7.22)

42.40 to 78.00

Δ Kmax

0.51 (1.46)

 − 2.80 to 5.90

Km, D

47.43 (4.89)

39.90 to 66.40

Δ Km

0.36 (0.59)

 − 0.90 to 2.20

K2, D

49.15 (5.56)

40.70 to 69.40

Δ K2

0.41 (0.86)

 − 1.70 to 2.90

PachyMin, μm

460.28 (46.99)

338.00 to 550.00

Δ PachyMin

 − 0.50 (11.34)

 − 32.00 to 36.00

D-Index

8.40 (4.61)

1.16 to 24.22

Δ D-Index

0.37 (0.82)

 − 1.22 to 2.97

3 mm PCR, mm

5.07 (0.66)

3.39 to 6.52

Δ 3 mm PCR

 − 0.08 (0.11)

 − 0.57 to 0.25

Astig, D

3.29 (2.37)

 − 0.80 to 10.60

Δ Astig

0.09 (0.73)

 − 1.80 to 2.30

  1. Summary of the sample characterization at baseline and characterization of tomographic indices. Results are expressed as mean ± SD for continuous variables (*results expressed as median ± IQR). Female gender and right eyes are expressed as count and percentage. BCVA, Best corrected visual acuity; SphEq, Spherical Equivalent; Kmax, maximum Keratometry; Km, mean Keratometry; K2, Keratometry of the steepest meridian; PachyMin, minimum Pachymetry; Astig, corneal astigmatism; 3 mm PCR, posterior radius of curvature from the 3.0 mm centered at the thinnest point; D-Index, Belin/Ambrósio Deviation Index; D, Diopter. Δ represents the variation of parameter readings between the first and the second measurement after 12 ± 3 months.